ISL 2017: 5 foreign signings who have played the most in Europe's top 5 leagues

#1 Robbie Keane - 349 Premier League appearances

Robbie Keane is an ATK player now

With a vast experience from around the world, the 37-year-old Irishman will be key to ATK's hopes of retaining their title. The Dublin-born striker started his career at Wolverhampton Wanders in 1997 and became an integral part of the team. Keane has played extensively in the English top-flight and his record of 349 Premier League appearances is among the best ever for an Irishman.

Keane's reputation and pedigree mark him out as the big marquee signing of the 2017-18 ISL season. Whether he can carry his goalscoring exploits from the Premier League to the ISL remains to be seen though.